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METHANE AND DUST CONTROL PRACTICES AT FACE AREAS (Cont.) <br />• <br />9. When using auxiliary fans, mining will not be allowetl with the <br />miner operator closer than two (2) feet from the end of the <br />large tubing unless the opening is effectively sealed or a <br />smaller tubiny of no greater than two (2) inches less in diame- <br />ter is used. <br />10. Half curtains will be utilized when turning crosscuts. Point <br />of deepest penetration will be measured perpendicular to <br />ventilation tubing centerline. <br />11. When mining with two continuous miners on one main intake <br />split, the return air from one continuous miner, which is <br />cutting coal, will not pass over the other continuous miner <br />while it is cutting coal. <br />• <br />Page Nine <br />Revised 04/13/81 <br />Revised 05/27/81 <br />• , Revised 08/05/82 <br />Revised 09/09/83 <br />Revised 06/25/84 <br />